Contact us
Choose a category below so we can get back to you as quickly as possible.
3m+7=-(-18) 3m+7=18 3m=11 m=11/3 注有a,b兩個數,b不為0 a/b=-1則a,b互為相反數 0的相反數為0
We and our partners use cookies and other technologies to analyze traffic and optimize your experience. View more info and control your cookies settings at any time in our Cookies Policy.